Toilet bowl

ABSTRACT

Provided is a toilet bowl comprising an upper forming body having an upper surface part that forms an upper surface of the toilet bowl in an installed state; and a lower forming body having an inner wall part joined to an inner edge part of the upper surface part, and an outer wall part joined to an outer edge part of the upper surface part. A space part is formed between the inner wall part and the outer wall part. A dimension in an up-down direction from a lower end of the space part to an upper surface of the inner wall part is larger than a dimension in the up-down direction from an upper end of the space part to the upper surface of the inner wall part.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority of Japanese Application No. 2019-086040 filed Apr. 26, 2019, the entire contents of which are incorporated herein by reference.

FIELD OF THE DISCLOSURE

The present disclosure relates to a toilet bowl.

BACKGROUND OF THE DISCLOSURE

Conventionally, a toilet bowl formed by joining an upper forming body and a lower forming body is known. For example, an upper forming body of a toilet bowl described in JP 2010-174450 A has an upper surface part forming an upper surface, and an inner wall part provided on a lower surface of the upper surface part. A lower end part of the inner wall part of the upper forming body and an outer edge part of the upper surface part thereof are joined to the lower forming body.

SUMMARY OF THE DISCLOSURE

However, in the above-described configuration, a joint surface with the lower forming body needs to be formed on the lower surface of the upper forming body so as to protrude greatly. For this reason, it is not easy to manufacture the upper forming body.

The present disclosure has been completed based on the above circumstances, and an object of the present disclosure is to provide a toilet bowl whose upper forming body can be manufactured easily.

The toilet bowl of the present disclosure includes: an upper forming body having an upper surface part that forms an upper surface of the toilet bowl in an installed state; and a lower forming body having an inner wall part and an outer wall part, the inner wall part being configured to be joined to an inner edge part of the upper surface part, the outer wall part being configured to be joined to an outer edge part of the upper surface part. In the toilet bowl, a space part is formed between the inner wall part and the outer wall part, and a dimension in an up-down direction from a lower end of the space part to an upper surface of the inner wall part is larger than a dimension in the up-down direction from an upper end of the space part to the upper surface of the inner wall part. Here, the inner edge part of the upper surface part is a portion of the upper surface part from a joint surface with the inner wall part to an inner end of the upper surface part.

The toilet bowl of the present disclosure includes: an upper forming body having an upper surface part that forms an upper surface of the toilet bowl in an installed state; and a lower forming body having an inner wall part and an outer wall part, the inner wall part being configured to be joined to an inner edge part of the upper surface part, the outer wall part being configured to be joined to an outer edge part of the upper surface part. In the toilet bowl, in a portion above a water discharge port in a bowl part hanging down from the inner edge part of the upper surface part, a dimension of the lower forming body in an up-down direction is larger than a dimension of the upper forming body in the up-down direction.

According to this disclosure, since a joint surface with the lower forming body does not need to be formed on the lower surface of the upper forming body so as to protrude greatly, the upper forming body can be manufactured easily.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a perspective view showing a toilet bowl in a state in which an upper forming body and a lower forming body are joined, according to some embodiments;

FIG. 2 is a plan view showing the toilet bowl in a state in which the upper forming body and the lower forming body are joined, according to some embodiments;

FIG. 3 is a cross-sectional perspective view showing the toilet bowl in a state in which the upper forming body and the lower forming body are joined, taken along a line A-A in FIG. 2, according to some embodiments;

FIG. 4 is a cross-sectional view showing the toilet bowl in a state in which the upper forming body and the lower forming body are joined, corresponding to a cross section taken along a line B-B in FIG. 2, according to some embodiments;

FIG. 5 is a perspective view showing a state before the upper forming body and the lower forming body are joined, according to some embodiments;

FIG. 6 is a bottom view showing the upper forming body, according to some embodiments;

FIG. 7 is a plan view showing the lower forming body, according to some embodiments;

FIG. 8 is a cross-sectional view showing a joint surface between the upper forming body and the lower forming body, corresponding to a cross section taken along a line C-C in FIG. 2, according to some embodiments;

FIG. 9 is a cross-sectional view showing an example of a joint surface between an upper forming body and a lower forming body in a toilet bowl, according to some embodiments;

FIG. 10 is a cross-sectional view showing another example of the joint surface between the upper forming body and the lower forming body, according to some embodiments;

FIG. 11 is a cross-sectional view showing an example of a joint surface between an upper forming body and a lower forming body in a toilet bowl, according to some embodiments;

FIG. 12 is a cross-sectional view showing a joint surface between an upper forming body and a lower forming body in a toilet bowl, according to some embodiments; and

FIG. 13 is a plan view showing a toilet bowl in a state in which an upper forming body and a lower forming body are joined, according to some embodiments.

DETAILED DESCRIPTION OF THE DISCLOSURE

Embodiments of the present disclosure will be described below. In the toilet bowl of the present disclosure, an inner edge part of the upper surface may be an inner edge curved surface bulging upward continuously from an inner end edge of an inner edge joint surface where a lower surface of the inner edge part of the upper surface part and the upper surface of the inner wall part are joined. According to such a configuration, the inner end edge of the inner edge joint surface is less noticeable, so that the appearance can be improved.

In the toilet bowl of the present disclosure, an inner surface of an upper end part of the inner wall part may have an angle close to vertical. Here, a toilet bowl in which the inner surface of the upper end part of the inner wall part forms an angle close to vertical is called a so-called rimless toilet bowl, and in such a rimless toilet bowl, the inner end edge of the inner edge joint surface, when located on the substantially vertical inner surface, is conspicuous. However, according to the present disclosure, the inner end edge of the inner edge joint surface is located within the inner edge curved surface, and thus is less noticeable. Therefore, the appearance can be improved even when the toilet bowl has a rimless shape.

In the toilet bowl of the present disclosure, an outer edge part of the upper surface may be an outer edge curved surface bulging upward continuously from an outer end edge of an outer edge joint surface where a lower surface of the outer edge part of the upper surface part and an upper surface of the outer wall part are joined. According to such a configuration, the outer end edge of the outer edge joint surface is less noticeable, so that the appearance can be improved.

In the toilet bowl of the present disclosure, the outer edge joint surface may have an inclined part inclined obliquely downward from the outer end edge toward an inside. According to such a configuration, even if the outer edge curved surface has a small radius, a thickness dimension of the upper forming body can be ensured, so that the upper forming body can be manufactured easily.

In the toilet bowl of the present disclosure, the inner edge joint surface may have an inclined part inclined obliquely downward from the inner end edge toward an outside. According to such a configuration, even if the inner edge curved surface has a small radius, the thickness dimension of the upper forming body can be ensured, so that the upper forming body can be manufactured easily.

In the toilet bowl of the present disclosure, the lower surface of the inner edge part of the upper surface part may be larger in dimension in an inner-outer direction than the upper surface of the inner wall part, and the lower surface of the outer edge part of the upper surface part may be larger in dimension in the inner-outer direction than the upper surface of the outer wall part.

Hereinafter, a toilet bowl 10 which embodies the present disclosure will be described in detail with reference to FIGS. 1 to 8.

As shown in FIG. 1, toilet bowl 10 has an upper surface part 11 forming an upper surface, a bowl part 12 hanging down from an inner edge part of the upper surface part 11, and a peripheral wall part 13 hanging down from an outer edge part of the upper surface part 11. In the following description of each component, the upper side in FIG. 1 is upper, the lower side in FIG. 1 is lower, the lower side in FIG. 2 is front, and the upper side in FIG. 2 is back, the right side in FIG. 2 is left, and the left side in FIG. 2 is right, based on the orientation of a person sitting on the toilet bowl 10 in a normal posture.

As shown in FIG. 2, the upper surface part 11 has an annular shape slightly long in the front-back direction. The upper surface part 11 includes a rim part 14 that is continuous from the front side to both left and right sides, and a connecting part 15 that connects a back end part of the rim part 14 in the let-right direction. The rim part 14 has a substantially constant width dimension (dimension in an inner-outer direction). The connecting part 15 is provided with a recess part 16 whose upper surface is recessed downward relative to an upper surface of the rim part 14. Steps are formed on both left and right surfaces and a back surface of the recess part 16. A front surface of the recess part 16 is open.

The connecting part 15 is provided with a protrusion part 17 that protrudes a step backward from the back end of the rim part 14. An upper surface of the protrusion part 17 and the upper surface of the rim part 14 are continuous substantially horizontally. As shown in FIG. 3, a thickness dimension (dimension in an up-down direction) of the protrusion part 17 is larger than a thickness dimension of the rim part 14. The protrusion part 17 has a flat box shape and a space part inside thereof.

The bowl part 12 includes an upright surface part 18, a shelf part 19, a bowl surface part 21 and a water storage part 22, as shown in FIGS. 3 and 4. The upright surface part 18 is provided at an upper end part of the bowl part 12. The upright surface part 18 stands substantially vertically. The toilet bowl 10 is a so-called rimless toilet bowl. The shelf part 19 overhangs from a lower end of the upright surface part 18 toward the center of the bowl part 12. The bowl surface part 21 is inclined downward from an inner edge part of the shelf part 19 toward the center of the bowl part 12. The water storage part 22 is provided so as to be recessed downward from a lower end of the bowl surface part 21. The upright surface part 18, the shelf part 19 and the bowl surface part 21 are provided continuously in an annular shape. The water storage part 22 is provided with an inlet of a drainage channel 23 for discharging excrements from the bowl part 12.

A water discharge port 24 is provided in a back side region of the bowl part 12, as shown in FIG. 3. The water discharge port 24 is provided on a right side surface of the bowl part 12. The water discharge port 24 is opened to the front side.

A water passage 25 for supplying flush water to the bowl part 12 extends on the back side of the water discharge port 24. The water passage 25 is formed on the outer peripheral side of the upright surface part 18. The flush water supplied to the water passage 25 is discharged from the water discharge port 24 into the bowl part 12.

The peripheral wall part 13 covers the periphery of the bowl part 12 (front surface and both right and left side surfaces). A lower end of the peripheral wall part 13 is installed on the floor.

The toilet bowl 10 is formed by joining an upper forming body 30 and a lower forming body 40 as shown in FIG. 5.

The upper forming body 30 has the upper surface part 11 and a water passage upper part 31 that forms an upper portion of the water passage 25. The upper surface part 11 includes the rim part 14 and the connecting part 15.

The upper forming body 30 has a flat plate shape. Here, a flat plate shape means a substantially flat plate shape, and includes a shape having a slight step or protrusion on an upper or lower surface of the upper forming body 30. As long as a height dimension of the step or protrusion is not more than an average height of the upper forming body 30, and desirably, not more than half of the average height thereof, it is a flat plate shape. That is, a height dimension of a protrusion part T formed on a lower surface of the upper forming body 30 illustrated at the upper right corner of the toilet bowl 10 shown in FIG. 4 is not more than the average height of the upper forming body 30, and is not more than half of the average height of the upper forming body 30. Therefore, the portion, shown at the upper right corner of FIG. 4, of the upper forming body 30 is of a flat plate shape.

The lower surface of the upper forming body 30 is formed of a plane. In other words, the lower surface of the upper forming body 30 smoothly continues from an inner edge upper joint surface 39U which will be described later to an outer edge upper joint surface 39S which will be described later. Here, a plane means a substantially flat surface, and includes a surface having a slight step or protrusion on the lower surface of the upper forming body 30. As long as a height dimension of the step or protrusion is not more than an average height of the upper forming body 30, and desirably, not more than half of the average height thereof, it is a plane. That is, the height dimension of the protrusion part T on the lower surface of the upper forming body 30 illustrated at the upper right corner of the toilet bowl 10 shown in FIG. 4 is not more than the average height of the upper forming body 30, and is not more than half of the average height thereof. Therefore, the lower surface of the portion, shown at the upper right corner of FIG. 4, of the upper forming body 30 is a plane.

As shown in FIG. 6, the lower surface of the upper forming body 30 has a plane part 32 without unevenness. The plane part 32 is provided on the right side of the upper forming body 30. The plane part 32 extends rightward from the front end of the rim part 14 and continues up to a slightly front side relative to the center in the front-back direction.

The upper forming body 30 has a reinforcing part 34 having a rib 33 protrudingly provided on its lower surface. The reinforcing part 34 is provided on the left side of the upper forming body 30. The rib 33 is formed in the center of the rim part 14 in the width direction (inner-outer direction). The rib 33 extends in the circumferential direction along the rim part 14. In the lower surface of the reinforcing part 34, an inner peripheral surface 34U and an outer peripheral surface 34S are formed on the inner peripheral side and the outer peripheral side, respectively, of the rib 33 so as to be continuous with a lower surface of the plane part 32 without any step. The inner peripheral surface 34U and the outer peripheral surface 34S are a part of the inner edge upper joint surface 39U and the outer edge upper joint surface 39S, respectively, which will be described later.

The water passage upper part 31 is provided on the right side of the upper forming body 30. The water passage upper part 31 protrudes downward on a lower surface 30U of the upper forming body 30. The water passage upper part 31 is provided inside the rim part 14. An outer peripheral surface 31S is formed on the outer peripheral side of the water passage upper part 31 on the lower surface of the upper forming body 30 so as to be continuous with the lower surface of the plane part 32 without any step. On a lower surface of the water passage upper part 31, a water passage inner peripheral wall 35 standing on the inner peripheral side of the water passage 25 and a water passage outer peripheral wall 36 standing on the outer peripheral side of the water passage 25 are protrudingly provided. The water discharge port 24 is formed between a front end part of the water passage inner peripheral wall 35 and the water passage outer peripheral wall 36.

As shown in FIG. 3, the lower surface of the water passage upper part 31 is inclined obliquely upward from a front end of the water passage inner peripheral wall 35 toward the front side. A front end of the water passage upper part 31 is continuous with the lower surface of the plane part 32 (see FIG. 6). The inside of the water passage upper part 31 is hollow (see FIG. 4). The inner wall of the water passage upper part 31 constitutes the upright surface part 18.

On a lower surface of the back end part of the upper forming body 30, a projection part 37 is formed, as shown in FIG. 3. The projection part 37 extends over the entire width of the upper forming body 30 in the let-right direction, as shown in FIG. 6. Both left and right end parts of the projection part 37 are continuous with the outer peripheral surfaces 31S and 34S. The projection part 37 has a first lateral part 37F extending along a back end of the protrusion part 17, a second lateral part 37S extending along a front end of the protrusion part 17, and a longitudinal part 37T connecting the first lateral part 37F and the second lateral part 37S in the front-back direction. The first lateral part 37F is provided at a central part of the upper forming body 30 in the let-right direction. The second lateral part 37S is provided on both left and right sides of the first lateral part 37F. The longitudinal part 37T extends substantially in parallel from both left and right ends of the first lateral part 37F toward an end part of the second lateral part 37S. On the lower surface of the back end part of the upper forming body 30, a back end inner peripheral surface 38 is provided so as to be continuous with the inner peripheral surface 34U of the reinforcing part 34. A left end of the back end inner peripheral surface 38 is continuous with the inner peripheral surface 34U of the reinforcing part 34, and a right end of the back end inner peripheral surface 38 is continuous with the water passage inner peripheral wall 35.

The lower surface of the upper forming body 30 is provided with a joint surface with the lower forming body 40 (referred to as upper joint surface 39). The upper joint surface 39 has the inner edge upper joint surface 39U provided on an inner edge part of the upper forming body 30, and the outer edge upper joint surface 39S provided on an outer edge part of the upper forming body 30. The inner edge upper joint surface 39U is constituted of an inner edge part of the lower surface of the plane part 32, the inner peripheral surface 34U of the lower surface of the reinforcing part 34, the back end inner peripheral surface 38, and an inner peripheral edge part of the water passage upper part 31 (including the water passage inner peripheral wall 35). The outer edge upper joint surface 39S is constituted of an outer edge part of the lower surface of the plane part 32, the outer peripheral surface 34S of the lower surface of the reinforcing part 34, a lower surface of the projection part 37, and the outer peripheral surface 31S of the water passage upper part 31.

As shown in FIG. 8, an inner edge curved surface 26U and an outer edge curved surface 26S are formed on an inner edge part and an outer edge part, respectively, of the upper surface of the upper forming body 30. The inner edge curved surface 26U is continuous over the entire periphery of the inner edge part. Specifically, as shown in FIGS. 2 and 3, the inner edge curved surface 26U is formed at an inner edge part of the rim part 14 and a front end edge part of the recess part 16. The outer edge curved surface 26S is continuous over the entire periphery of the outer edge part. Specifically, the outer edge curved surface 26S is formed on an outer edge part of the rim part 14 and a back end edge part of the connecting part 15.

Upper ends of the inner edge curved surface 26U and the outer edge curved surface 26S are continuous with the upper surface of the rim part 14, as shown in FIG. 8. Lower ends R1 of the inner edge curved surface 26U and the outer edge curved surface 26S are horizontally continuous with the lower surface of the rim part 14. The radii of the inner edge curved surface 26U and the outer edge curved surface 26S are substantially equal to a thickness dimension (dimension in the up-down direction) of the plane part 32 of the rim part 14.

As shown in FIG. 8, the lower forming body 40 has an inner wall part 41 joined to the inner edge part of the upper surface part 11, and an outer wall part 42 joined to the outer edge part of the upper surface part 11. The inner wall part 41 and the outer wall part 42 are protrudingly provided on an upper surface part of the lower forming body 40 (referred to as a lower forming body upper surface part 43). A groove part 44 is formed between the outer wall part 42 and the inner wall part 41. The inner wall part 41 and the outer wall part 42 are portions above a lower end of the groove part 44. A depth dimension (dimension in the up-down direction) of the groove part 44, that is, a height dimension (dimension in the up-down direction) of the inner wall part 41 and the outer wall part 42, respectively, is larger than a protrusion dimension of the rib 33. A width dimension (dimension in the inner-outer direction) of the groove part 44 is larger than a width dimension of the rib 33.

In a state in which the upper forming body 30 and the lower forming body 40 are joined, a space part A is formed by being surrounded by the upper surface part 11, the inner wall part 41, the outer wall part 42, and the lower forming body upper surface part 43. The inner wall part 41 and the outer wall part 42 are portions above a lower end of the space part A. As shown in FIG. 8, an upper surface of the space part A is formed by the upper forming body 30. Side surfaces of the space part A (left and right side surfaces in FIG. 8) are formed only by the lower forming body 40. That is, in FIG. 8, a dimension in the up-down direction from an upper end of the space part A to an inner edge lower joint surface 47U and a dimension in the up-down direction from the upper end of the space part A to an outer edge lower joint surface 47S are both zero. In FIG. 8, the left side surface and right side surface of the space part A are a surface that stands from the lower end of the space part A to the upper left side and a surface that stands from the lower end of the space part A to the upper right side, respectively.

The inner wall part 41 is provided along the upper end of the bowl part 12, as shown in FIG. 8. The inner wall part 41 constitutes the upright surface part 18. As shown in FIG. 7, the shape of the inner wall part 41 is annular in plan view. The planar shape of the inner wall part 41 matches the planar shape of the inner edge upper joint surface 39U of the upper forming body 30. The inner wall part 41 is substantially continuous over the entire periphery except for a part where the water discharge port 24 is formed. As shown in FIGS. 3 and 5, the inner wall part 41 has an inclined inner wall part 41K whose upper surface is inclined along the inclination of the lower surface of the water passage upper part 31.

As shown in FIG. 7, the outer wall part 42 has a first outer wall part 45 provided continuously from the front side of the lower forming body 40 to both left and right sides thereof, and a second outer wall part 46 provided so as to connect back ends of the first outer wall part 45 right and left. The first outer wall part 45 constitutes the peripheral wall part 13. An upper surface of the first outer wall part 45 is a substantially horizontal surface as shown in FIG. 8. The upper surface of the first outer wall part 45 is located at substantially the same height as an upper surface of the inner wall part 41. An upper surface of the second outer wall part 46 is located below the upper surface of the first outer wall part 45, as shown in FIG. 5. As shown in FIG. 7, the second outer wall part 46 has a first lateral part 46F, a second lateral part 46S, and a pair of longitudinal parts 46T, as in the projection part 37 of the upper forming body 30.

The upper surface of the lower forming body 40 is provided with a joint surface with the upper forming body 30 (referred to as lower joint surface 47). As shown in FIG. 7, the lower joint surface 47 has the inner edge lower joint surface 47U constituted of the upper surface of the inner wall part 41 (including the inclined inner wall part 41K), and the outer edge lower joint surface 47S constituted of the upper surface of the outer wall part 42. As shown in FIG. 4, a width dimension (dimension in the inner-outer direction) of the inner edge lower joint surface 47U is smaller than a width dimension of the inner edge upper joint surface 39U. A width dimension of the outer edge lower joint surface 47S is smaller than a width dimension of the outer edge upper joint surface 39S.

The upper forming body 30 and lower forming body 40 thus formed are joined. Intermediate molded products having the shape of the upper forming body 30 and the lower forming body 40 are manufactured by use of a mold (not shown), and a joining slurry is applied to the upper joint surface 39 and the lower joint surface 47 of the intermediate molded product for joining. At this time, as shown in FIG. 8, an inner end edge of the inner edge upper joint surface 39U and an inner end edge of the inner edge lower joint surface 47U are aligned so as not to be deviated in a plane direction. An outer end edge of the outer edge upper joint surface 39S and the outer end edge of the outer edge lower joint surface 47S are also aligned so as not to be deviated in a plane direction. As shown in FIG. 4, since the width dimension of the inner edge upper joint surface 39U is larger than the width dimension of the inner edge lower joint surface 47U, an inner portion of the inner edge upper joint surface 39U is exposed. Since the width dimension of the outer edge upper joint surface 39S is larger than the width dimension of the outer edge lower joint surface 47S, an inner portion of the outer edge upper joint surface 39S is exposed. The upper forming body 30 and the lower forming body 40 are thus joined, dried and fired to complete the toilet bowl 10.

In the toilet bowl 10 in a completed state, the joint surface 27 between the lower forming body 40 and the upper forming body 30 is located at the lower ends R1 of the inner edge curved surface 26U and the outer edge curved surface 26S, as shown in FIG. 8. The joint surface 27 has an inner edge joint surface 27U formed by joining the inner edge upper joint surface 39U and the inner edge lower joint surface 47U, and an outer edge joint surface 27S formed by joining the outer edge upper joint surface 39S and the outer edge lower joint surface 47S. An inner end edge 28 of the joint surface 27 is an inner end edge of the inner edge upper joint surface 39U and the inner edge lower joint surface 47U. The inner end edge 28 of the joint surface 27 is formed along a lower end of the inner edge curved surface 26U over the entire periphery except for a portion corresponding to the water passage upper part 31. An outer end edge 29 of the joint surface 27 is an outer end edge of the outer edge upper joint surface 39S and the outer edge lower joint surface 47S. The outer end edge 29 of the joint surface 27 is formed along the lower end R1 of the outer edge curved surface 26S over the entire periphery except for the back end part of the rim part 14 and the connecting part 15. The back end part of the rim part 14 and the outer end edge 29 of the joint surface 27 of the connecting part 15 are covered and hidden with a cover member (not shown).

Next, the actions and effects of the embodiments configured as described above will be described.

The toilet bowl 10 of some embodiments includes the upper forming body 30 having the upper surface part 11 that forms the upper surface; and the lower forming body 40 having the inner wall part 41 which is joined to the inner edge part of the upper surface part 11, and the outer wall part 42 which is joined to the outer edge part of the upper surface part 11. According to this configuration, since the upper joint surface 39, which is the joint surface with the lower forming body 40, does not need to be formed on the lower surface 30U of the upper forming body 30 so as to protrude, the upper forming body 30 can be manufactured easily.

The inner edge part of the upper surface is the inner edge curved surface 26U bulging upward continuously from the inner end edge 28 of the inner edge joint surface 27U where the lower surface of the inner edge part of the upper surface part 11 and the upper surface of the inner wall part 41 are joined. According to this configuration, the inner end edge 28 of the inner edge joint surface 27U is less noticeable, so that the appearance can be improved.

In an installed state, the inner surface of the upper end part of the inner wall part 41 has an angle close to vertical. In the so-called rimless toilet bowl 10, the inner end edge 28 of the inner edge joint surface 27U, when located on the substantially vertical wall surface, is conspicuous. However, according to the toilet bowl 10 of some embodiments, the inner end edge 28 of the inner edge joint surface 27U is located within the range of the inner edge curved surface 26U, and thus is less noticeable. Therefore, the appearance can be improved even when the toilet bowl 10 has a rimless shape.

The outer edge part of the upper surface is the outer edge curved surface 26S bulging upward continuously from the outer end edge 29 of the outer edge joint surface 27S where the lower surface of the outer edge part of the upper surface part 11 and the upper surface of the outer wall part 42 are joined. According to this configuration, the outer end edge 29 of the outer edge joint surface 27S is less noticeable, so that the appearance can be improved.

Next, a toilet bowl 50 according to some embodiments will be described with reference to FIGS. 9 and 10.

The toilet bowl 50 of some embodiments comprises outer edge joint surface 27S having an inclined part 52 inclined obliquely downward from the outer end edge 29 toward an inside.

The toilet bowl 50 according to some embodiments is formed by joining the upper forming body 30 and the lower forming body 40. The upper forming body 30 has the upper surface part 11, and the upper joint surface 39 is provided on the lower surface of the upper forming body 30. The upper forming body 30 has a flat plate shape. That is, a height dimension of a step D formed on the lower surface of the upper forming body 30 is not more than the average height of the upper forming body 30, and is not more than half of the average height thereof.

The upper joint surface 39 has the inner edge upper joint surface 39U provided on the inner peripheral side of the upper forming body 30, and the outer edge upper joint surface 39S provided on the outer peripheral side of the upper forming body 30. The inner edge part of the upper surface part 11 of the upper forming body 30 has an overhang part 55 protruding inward relative to the inner wall part 41 of the lower forming body 40. That is, the inner edge part of the upper surface part 11 includes a portion from the joint surface with the inner wall part 41 (inner edge upper joint surface 39U) to a tip end of the overhang part 55. In some embodiments, the inner edge curved surface 26U and the outer edge curved surface 26S are formed on the inner edge part and the outer edge part, respectively, of the upper surface of the upper forming body 30.

In some embodiments, the lower forming body 40 has the inner wall part 41 joined to the inner edge part of the upper surface part 11 and the outer wall part 42 joined to the outer edge part of the upper surface part 11, and the lower joint surface 47 is provided on the upper surface of the lower forming body 40. In some embodiments, the lower joint surface 47 has the inner edge lower joint surface 47U constituted of the upper surface of the inner wall part 41, and the outer edge lower joint surface 47S constituted of the upper surface of the outer wall part 42.

The outer edge joint surface 27S (the outer edge upper joint surface 39S and the outer edge lower joint surface 47S) has an inclined part 52 inclined obliquely upward from the lower surface 30U of the upper forming body 30 toward the outer edge curved surface 26S. The outer end edge of the inclined part 52 (the outer end edge 29 of the outer edge joint surface 27S) shown in FIG. 9 is located at the lower end R1 of the outer edge curved surface 26S. The outer end edge of the inclined part 52 (the outer end edge 29 of the outer edge joint surface 27S) shown in FIG. 10 is located in the middle of the outer edge curved surface 26S. The lower surface 30U of the upper forming body 30 is located below the lower end R1 of the outer edge curved surface 26S in each of the toilet bowls 50 shown in FIGS. 9 and 10. The thickness dimension (dimension in the up-down direction) H1 of the rim part 14 of the upper forming body 30 is larger than the radius of the outer edge curved surface 26S. In the upper forming body 30, a portion that is above the inclined part 52 has a greater thickness dimension in the toilet bowl 50 shown in FIG. 9 than in the toilet bowl 50 shown in FIG. 10. Thus, by changing the inclination angle of the inclined part 52, the thickness dimension of the upper forming body 30 can be changed.

As described above, since the outer edge joint surface 27S has the inclined part 52 inclined obliquely downward from the outer end edge 29 toward the inside, the thickness dimension of the upper forming body 30 can be ensured even if the outer edge curved surface 26S has a small radius.

Next, a toilet bowl 60 which embodies the present disclosure will be described with reference to FIG. 11.

The toilet bowl 60 of some embodiments comprises an overhang part 61 in which the inner edge part of the upper surface part 11 protrudes inward relative to the inner wall part 41 of the lower forming body 40, and that a leg part 62 is provided on the lower surface 30U of the upper forming body 30.

In the toilet bowl 60 according to some embodiments, the outer edge joint surface 27S has the inclined part 52 inclined obliquely downward from the outer end edge 29 toward the inside. The upper forming body 30 has the leg part 62 hanging down from the upper surface part 11 at the position corresponding to the inner wall part 41. A lower surface of the leg part 62 constitutes the inner edge upper joint surface 39U which is joined to the upper surface of the inner wall part 41 (inner edge lower joint surface 47U). Since the upper forming body 30 has the leg part 62, the strength of the upper forming body 30 can be increased. Since the overhang part 61 overhangs above the inner end edge 28 of the joint surface 27, the inner end edge 28 of the joint surface 27 is difficult to see, so that the deterioration in appearance can be prevented.

In the toilet bowl 60 according to some embodiments, the space part A is formed between the inner wall part 41 and the outer wall part 42. Thus, in a state in which the upper forming body 30 and the lower forming body 40 are joined, a space part A is formed by being surrounded by the upper surface part 11, the inner wall part 41, the outer wall part 42, and the lower forming body upper surface part 43. In some embodiments, the upper surface of the space part A is formed by the upper forming body 30, as shown in FIG. 11. Side surfaces of the space part A (left and right side surfaces in FIG. 11) are formed by the upper forming body 30 and the lower forming body 40. Specifically, one side surface (side surface on the side of the outer wall part 42) of the space part A is formed only by the lower forming body 40. The other side surface (side surface on the side of the inner wall part 41) of the space part A is formed by the upper forming body 30 and the lower forming body 40. In the other side surface of the space part A, a height dimension H5 of the lower forming body 40 (dimension in the up-down direction from the lower end of the space part A to the inner edge lower joint surface 47U) is larger than a height dimension H6 of the upper forming body (dimension in the up-down direction from the upper end of the space part A to the inner edge lower joint surface 47U). The height dimension H5 of the lower forming body 40 is a dimension in the up-down direction of the inner wall part 41. In the side surfaces of the space part A, it is desirable that the height dimension H6 of the upper forming body 30 be not more than half of the height dimension H5 of the lower forming body 40.

Next, a toilet bowl 70 which embodies the present disclosure will be described with reference to FIG. 12.

The toilet bowl 70 of some embodiments is different from that of the first embodiment in that no space part is formed between the inner wall part 41 and the outer wall part 42, that is, a space between the inner wall part 41 and the outer wall part 42 is filled.

The toilet bowl 70 according to some embodiments is formed by joining the upper forming body 30 and the lower forming body 40. The upper forming body 30 has the upper surface part 11, and the upper joint surface 39 is provided on the lower surface of the upper forming body 30, as in the first embodiment. The upper joint surface 39 has the inner edge upper joint surface 39U provided on the inner peripheral side of the upper forming body 30, and the outer edge upper joint surface 39S provided on the outer peripheral side of the upper forming body 30. As in the first embodiment, the inner edge curved surface 26U and the outer edge curved surface 26S are formed on the inner edge part and the outer edge part, respectively, of the upper surface of the upper forming body 30.

In some embodiments, the lower forming body 40 has the inner wall part 41 joined to the inner edge part of the upper surface part 11, and the outer wall part 42 joined to the outer edge part of the upper surface part 11. The inner wall part 41 is the inner portion of the upper end part of the lower forming body 40, and the outer wall part 42 is the outer portion of the upper end part of the lower forming body 40.

The lower joint surface 47 is provided on the upper surface of the lower forming body 40. In some embodiments, the lower joint surface 47 has the inner edge lower joint surface 47U constituted of the upper surface of the inner wall part 41, and the outer edge lower joint surface 47S constituted of the upper surface of the outer wall part 42. The upper surface of the lower forming body 40 is a plane, and the inner edge lower joint surface 47U and the outer edge lower joint surface 47S are each a part of the same plane.

In a portion above the water discharge port 24 (referred to as rim inner wall surface R) in the bowl part 12 hanging down from the inner edge part of the upper surface part, a height dimension (dimension in the up-down direction) H7 of the lower forming body 40 is larger than a height dimension (dimension in the up-down direction) H8 of the upper forming body 30. The rim inner wall surface R refers to a portion from an upper end position of the shelf part 19 (height position of the water discharge port 24) to the upper surface of the upper surface part 11 as shown in FIG. 4.

The present disclosure is not limited to the embodiments described by the above description and drawings, and the following embodiments are also included in the technical scope of the present disclosure.

In some embodiments, the upper forming body 30 has a whole of the entire upper surface part 11 of the toilet bowls 10, 50, 60 and 70, but the present disclosure is not limited thereto. The upper forming body 30 may have only a part of the upper surface part 11 of the toilet bowl. For example, as shown in FIG. 13, only a portion, including the connecting part 15 and the water passage upper part 31, of the upper surface part 11 of a toilet bowl 80 may be formed as an upper forming body 81, and the other portion may be integrally formed with a lower forming body 82.

In some embodiments, the inner edge curved surface 26U is equal, in radius, to the outer edge curved surface 26S. However, the present disclosure is not limited to this. The inner edge curved surface and the outer edge curved surface may have different radii.

In some embodiments, the inner end edge 28 of the joint surface 27 between the lower forming body 40 and the upper forming body 30 is located within the inner edge curved surface 26U, and the outer end edge 29 of the joint surface 27 is located within the range of the outer edge curved surface 26S. However, the present disclosure is not limited to this, and the inner end edge and outer end edge of the joint surface may not necessarily be located within the curved surfaces, or only one of them may be located within the curved surface.

The above embodiments have exemplified the cases where the present disclosure is applied to the so-called rimless toilet bowls 10, 50, 60, 70 and 80. However, the present disclosure is not limited to this, and can also be applied to a rimmed toilet bowl.

In some embodiments, the outer edge joint surface 27S has the inclined part 52 inclined obliquely downward from the outer end edge 29 toward the inside, but the present disclosure is not limited thereto. The inner edge joint surface may have an inclined part inclined obliquely downward from the inner end edge toward the outside. 

What is claimed is:
 1. A toilet bowl comprising: an upper forming body having an upper surface part that forms an upper surface of the toilet bowl in an installed state; and a lower forming body having an inner wall part and an outer wall part, the inner wall part being configured to be joined to an inner edge part of the upper surface part, the outer wall part being configured to be joined to an outer edge part of the upper surface part, wherein a space part is formed between the inner wall part and the outer wall part, and wherein a dimension in an up-down direction from a lower end of the space part to an upper surface of the inner wall part is larger than a dimension in the up-down direction from an upper end of the space part to the upper surface of the inner wall part.
 2. The toilet bowl of claim 1, wherein an inner edge part of the upper surface of the toilet bowl is an inner edge curved surface bulging upward continuously from an inner end edge of an inner edge joint surface where a lower surface of the inner edge part of the upper surface part and the upper surface of the inner wall part are joined.
 3. The toilet bowl of claim 2, wherein an inner surface of an upper end part of the inner wall part has an angle close to vertical.
 4. The toilet bowl of claim 1, wherein an outer edge part of the upper surface of the toilet bowl is an outer edge curved surface bulging upward continuously from an outer end edge of an outer edge joint surface where a lower surface of the outer edge part of the upper surface part and an upper surface of the outer wall part are joined.
 5. The toilet bowl of claim 4, wherein the outer edge joint surface has an inclined part inclined obliquely downward from the outer end edge toward an inside.
 6. The toilet bowl of claim 2, wherein the inner edge joint surface has an inclined part inclined obliquely downward from the inner end edge toward an outside.
 7. The toilet bowl of claim 1, wherein the lower surface of the inner edge part of the upper surface part is larger in dimension in an inner-outer direction than the upper surface of the inner wall part, and wherein the lower surface of the outer edge part of the upper surface part is larger in dimension in the inner-outer direction than the upper surface of the outer wall part.
 8. A toilet bowl comprising: an upper forming body having an upper surface part that forms an upper surface of the toilet bowl in an installed state; and a lower forming body having an inner wall part and an outer wall part, the inner wall part being configured to be joined to an inner edge part of the upper surface part, the outer wall part being configured to be joined to an outer edge part of the upper surface part, wherein, in a portion above a water discharge port in a bowl part hanging down from the inner edge part of the upper surface part, a dimension of the lower forming body in an up-down direction is larger than a dimension of the upper forming body in the up-down direction. 